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Sun, 04 Nov 2018 12:18:34 GMT2018-11-04T12:18:34ZSGI and SPI for Drought Characteristics in Gaoping River Basin, Taiwanhttp://hdl.handle.net/11455/93709
標題: SGI and SPI for Drought Characteristics in Gaoping River Basin, Taiwan; 以標準化地下水與降雨指數法評估高屏溪流域之乾旱特性
作者: 葉信富; 張家富; 李哲瑋; 李振誥; Hsin-Fu Yeh; Chia-Fu Chang; Jhe-Wei Lee; Cheng-Haw Lee
摘要: Taiwan has been facing severe water crises in recent years owing to the effects of extreme weather conditions. Changes in precipitation patterns have also made the drought phenomenon increasingly prominent, indirectly affecting groundwater recharge. Hence, in the present study, long-term monitoring data were collected from the study area of the Kaoping River Basin. Specifically, data from six selected groundwater level stations and six precipitation stations in the vicinity were collected between 1997 and 2014. The standardized groundwater index (SGI) and standardized precipitation index (SPI) were then used to analyze the region's drought characteristics. The results revealed continuous droughts occurred in the river basin from 2003 to 2005. The trend for 2014 further indicated the drought situation in the region would worsen in terms of severity. After calculation and analysis of the cross correlation function between the SGI and the SPI, a positive correlation was identified between the maximum cross correlation function (q_(max)) and the duration of the drought event. The larger the q_(max) value, the longer the duration of the drought, and vice versa. The study also found the q_(max) value varied with geographical locations: it was smaller for the various measuring stations located along the Qishan and Laonong rivers, but tended to be larger for stations located beyond the Ailiao River. Thus, this study reckoned if a drought event were to occur in the latter area in the future, its duration would be relatively longer. The findings of this study could also serve as future reference for the water resources management of the Kaoping River Basin.; 近年來受到極端氣候的影響，臺灣面臨嚴重的缺水危機，且因降雨型態的改變，使得乾旱現象愈趨明顯，間接影響地下水的補注。因此，本研究以高屏溪流域作為研究區域，選定6 個地下水位站及鄰近6 個雨量站之長時間監測資料，利用標準化地下水指數評估法 (Standardised Groundwater Index, SGI) 與標準化雨量指數評估法 (Standardised Precipitation Index, SPI) 分析該區域乾旱特性。本研究分析高屏溪流域1997 年至2014 年地下水位與雨量資料，結果顯示，2003 年至2005 年為高屏溪流域之連續乾旱年，且由2014 年的趨勢判斷高屏溪流域乾旱之嚴重程度有逐漸上升的趨勢。另外，透過計算SGI 和SPI 兩者間的交互相關函數分析其最大交互相關函數 (q_(max))，結果顯示q_(max) 與乾旱事件持續的時間為正相關，並得知q_(max) 越大發生乾旱事件持續的時間越長，反之當q_(max) 越小則持續時間越短。且由研究結果發現q_(max) 具有地理位置上的差異性，位於旗山溪與荖濃溪所處各測站之q_(max) 較小，而位於隘寮溪以下測站之q_(max) 呈現較大之情形，所以未來若隘寮溪以下之區域發生乾旱事件，本研究推估其乾旱的持續時間也會相對較長。本研究結果亦可提供未來高屏溪流域水資源管理參考。Tue, 01 Mar 2016 00:00:00 GMThttp://hdl.handle.net/11455/937092016-03-01T00:00:00ZThe Feasibility for the High-turbidity Measured Method during Typhoon Events - Tested in Nan-Shi River as an Examplehttp://hdl.handle.net/11455/93708
標題: The Feasibility for the High-turbidity Measured Method during Typhoon Events - Tested in Nan-Shi River as an Example; 颱洪期間高濁度觀測方式可行性研究-以南勢溪為例
作者: 周伯愷; 許盈松; 劉建榮; Po-Kai Chou; Yin-Sung Hsu; Chien-Jung Liu
摘要: Following the concentration of suspended loads converted by different peak discharges of different typhoons, a significant correlation between the concentration and turbidity of the suspended load (SS-NTU relation) sampled artificially at Lan-Sheng Bridge on Nan-Shi River could be obtained in this study. The water turbidity, which was estimated by the suspended-load concentration (SS) measured automatically and SS-NTU relation analyzed in this study, was close to the artificial sampling data during the TRAMI typhoon and MATMO typhoon at Lan-Sheng Bridge. The estimation method of water turbidity suggested in this study could be applied to estimate water turbidity during typhoon events. The setting method of the automatic instrument suggested in this study could obtain precious data during typhoon events. It also could prevent the instrument from being covered, washed away or destroyed.; 本研究於南勢溪覽勝橋進行人工採樣，考慮不同颱洪事件流量差異可獲得一具有顯著相關性之SS-NTU 迴歸關係。透過福山站自動化SS 觀測與本研究獲得之SS-NTU 迴歸關係，進行潭美與麥德姆颱風的水質濁度推估，可獲得與人工採樣接近之結果，顯示本研究所提之濁度觀測推估方式，具有於颱洪高流量觀測之可行性與適用性。本研究建議之自動化觀測儀器設置方式，可獲得颱洪期間之SS 與NTU 資料，且可避免儀器遭到掩埋、流失或破壞。Tue, 01 Mar 2016 00:00:00 GMThttp://hdl.handle.net/11455/937082016-03-01T00:00:00ZDebris Flow Non-rectilinear Motion Case Study to Reflect Hazard Zone Delimitationhttp://hdl.handle.net/11455/93707
標題: Debris Flow Non-rectilinear Motion Case Study to Reflect Hazard Zone Delimitation; 非直進式土石流流動案例探討災害影響區之劃定
作者: 吳亭燁; 陳樹群; Ting-Yeh Wu; Su-Chin Chen
摘要: This study analyzed debris flow disasters in Siou-lin Township in Hualien County during typhoon Soula and summarized factors which triggered debris flow non-rectilinear motion. To clarify the existence of similar susceptibility at other torrents, continuous debris flow scenario simulations were given to five debris flow torrents in Kao-Ping river basin. The simulation results showed part of the debris flow torrents had the susceptibility of being non-rectilinear accumulation, and some of torrents had the same accumulation areas. Qualitative analysis showed this phenomenon occurs with differences in debris slide potential, gradient difference, and gully terrain inside the upstream sub-catchments. Finally, some recommendations were provided for the current hazard susceptibility analysis methods.; 本研究以蘇拉颱風在花蓮縣秀林鄉所引發之土石流事件，進行重建並歸納造成土石流改道之原因。為了解其他潛勢溪流是否具有改道之潛勢，透過地形因子選取高屏溪之五條潛勢溪流，進行連續事件的境況模擬。模擬結果顯示部分潛勢溪流具有土石流改道的潛勢，但部分之堆積型態不發生改變。透過定性分析，此種差異與潛勢溪流集水區內岩屑崩滑潛勢、坡度差異、和溝谷地形等有關，透過模擬分析結果，最後提出現行潛勢溪流潛勢度判定之建議。Tue, 01 Mar 2016 00:00:00 GMThttp://hdl.handle.net/11455/937072016-03-01T00:00:00ZPotential Landslide Hazard Zoning based on Numerical Simulation and Hazard Assessmenthttp://hdl.handle.net/11455/93706
標題: Potential Landslide Hazard Zoning based on Numerical Simulation and Hazard Assessment; 數值模擬與危害評估應用於潛在崩塌影響範圍之劃設
作者: 羅佳明; 馮正一; 鍾言鑫; 董雅婷; Chia-Ming Lo; Zheng-Yi Feng; Yan-Xin Zhong; Ya-Ting Dong
摘要: This study focused on the hazard zonation of potential deep-seated catastrophic landslides at the Chenyulan Creek watershed through numerical simulation and a hazard assessment method. Using the results of landform interpretation and geological surveys, we constructed a discrete element method to simulate the process of landslide movement and determine landslide hazard zonation. And then, we integrated landslide probability, kinetic energy, debris flow velocity, and debris front thickness to evaluate potential landslide hazard zoning in the study area. Finally, several landslide cases were simulated and the results can serve as a reference for disaster prevention, mapping and zoning of areas susceptible to geological hazards, and associated mitigation project planning.; 本研究主要探討臺灣陳友蘭溪五處研究區潛在大規模崩塌之影響範圍，經由潛在大規模崩塌區位地貌判釋與現場查核結果，分別以分離元素法建構五處研究區崩塌運移數值模型，以探討崩塌運移過程與致災影響範圍。本研究另於五處研究區數值模型假設兩種崩塌深度，並整合崩塌重現期、動能、邊坡滑動速度、土石流堆積厚度等模擬結果，進行各潛研究區影響範圍之危害度評估，作為後續災前整備、山崩地質敏感區劃設與治理工程規劃之參考。Tue, 01 Mar 2016 00:00:00 GMThttp://hdl.handle.net/11455/937062016-03-01T00:00:00Z